Re: 300 RUM or 338 RUM for 1000m hunting
MD, The GS Customs are an awesome hunting bullet. but they are much more effecient at shorter ranges. Gerard told me they need an impact velocity over 2400 to work best, of course the faster the better. their terminal performance at slower speeds is not the best. again, they are meant to be driven at very high velocities to work best. they are best suited for ranges under 500 yards.
secondly, the advertized BC's seems to be very generous. i can remember 2 individuals on here that tested them, along with several other bullets and their BC's were considerably lower than what is claimed.
generally speaking, at long range, the match bullets work best because of their long range accuracy, high BC's, and most importantly, their ability to kill at long range.